U.S. doctors online nowAsk doctors free
Miami, FL
A 25-year-old female asked:

What neurotransmitter causes pupils to constrict and muscles to contract?

3 doctor answers6 doctors weighed in
Dr. Marcel Hungs
Neurology 26 years experience
Acetylcholine: The most common neurotransmitter is acetylcholine.
Dr. William Gaya
Neurology 29 years experience
Neurotransmitter: Pupillary constriction is mediated by parasympathetic diners of the autonomic nervous system. Those, as well as the skeletal motor units controlling muscle contraction release acetylcholine as the neurotransmitter.
Dr. Andrew Reeves
Neurology 30 years experience
ACh: Acetylcholine. The physiology of muscle contraction is well outlined in many web sites. Happy studying!

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

Similar questions

A 38-year-old member asked:

What neurotransmitter causes muscles to contract?

1 doctor answer3 doctors weighed in
Dr. Daniel Hampton
Orthopedic Surgery 15 years experience
Neurotransmitter: Acetylcholine is the main neurotransmitter at the junction between nerves and muscles.

Related questions

A 39-year-old member asked:
1 doctor answer2 doctors weighed in
A 34-year-old male asked:
2 doctor answers5 doctors weighed in
A 33-year-old member asked:
1 doctor answer4 doctors weighed in

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
Last updated Sep 18, 2017

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.